Machine for making abrasive covers for buffing-machines.



No. 643,236. v Patented Fab. 13, 1900. A. w. ROGERS & s. w. wmsLuw.

MACHINE FOR MAKING ABRASIVE COVERS FDR BUFFING MACHINES.

" (Application filed June 14; 1897.) (No Model.) 4 Sheets-Sheet l.

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' 5W zawamszow No. 643,236. Patgnted Feb. 13, I900. A. W. ROGERS &. S. W. WINSLUW. MACHINE FOR MAKING ABRASIVE COVERS FUR BUFFING MACHINES.

(Application filed June 14, 1897.) (No Model.) 4 Sheets-Shani 2.

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No. 643,236. Patented Feb. I3, 1900.

A. w. means & s. w. WINSLOW. MAGHNE FOR MAKING ABRASIVE GOVERS FOR BUFFING MACHlNES.

(Application filed. June 14, 1897.) (No Model.) 4 Sheets-Sheet 3.

. ml-T Hum!!! 9 L tglo Patented Febrl3, I900. A. W. ROGERS & S. W. WINSLOW. I MACHINE FOR MAKING ABRASIVE COVERS FOR BUFFING MACHINES.

(Application filed June 14, 1897.) (No Model.) 4 Sheets8heet 4.

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U'rrn 'rarns ANDREW W. ROGERS AND SIDNEY W. WINSLOVV, OF BEVERLY, MASSACHU- SETTS, ASSIGNORS TO SIDNEY XV. \VINSLOV, TRUSTEE, OF SAME PLACE.

MACHINE FOR MAKING ABRASIVE COVERS FOR BUFFING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 643,236, dated February 13, 1900.

Application filed June 14, 1897. Serial No. 640,617. (No model.)

To all whom it may concern:

.Be it known that we, ANDREW W. ROGERS and SIDNEY W. WINSLOW, both of Beverly, county of Essex, and State of Massachusetts, 5 have invented an Improvement in Machines for Making Abrasive Covers for Buffing-Machines, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

This invention relates to a machine for making abrasive covers for the pads of buflingmachines, for bufiing the soles of boots and shoes, of the kind shown in patent to Winslow tld Fifield, No. 221,647, dated November 11, 1 79.

The present invention is embodied in a machine for making an abrasive cover from a single integral piece of abrasive material, said cover having a circular working face and a marginal portion molded to overlie the working face, thus forming an inturned flange between which and the working face the pad or foot of the buffing-machine is contained.

The machine shown for the purposes of illustrating is adapted to make, and is represented as operated to make, a pad-cover f the specific construction shown in patent to Andrew W. Rogers, No. 631,675, dated August 22, 1899.

The machine is adapted to make the padcovers from flat blanks previously cut from abrasive material, such as emery-cloth or sandpaper, the blank as herein shown being of substantially circular shape, but having its periphery notched or recessed, so as to afford a series of radial tongues extending'entirely around the same, and said blank is moistened to temper it before being introduced into the machine to be converted thereby into a padcover.

The machine is supplied with a removable combined former and holder, on which former the blank is molded by the operation of the machine, and by which former and holder the said molded blank is held or retained in the form imparted to it when removed, with said former and holder, from the machine, which may be provided with a sufficient number of such formers and holders to cooperate with successive blanks, while the blanks first formed ,into covers are being dried or set to shape so that they can be removed from the former and holder, which may then be used again in the machine.

The machine also comprises means for yield- 5 5 ingly holding the marginal portion of the blank while its central portion is subjected to pressure by the former above-mentioned, and means for contracting the marginal portion of the blank over the periphery of the former and so as to be held in contracted or molded condition by the former and holder, and means for actuating said appliances and auxiliary appliances for facilitating the operation of the machine.

Figure 1 is a plan view of a machine embodying this invention; Fig. 2, a side elevation thereof; Figs. 3 and 4:, details showing some of the actuatingrcams in side elevation; Fig. 5, a transverse vertical section on line 00 Fig. 1, the parts at the rear of the plane of sec tion being omitted for themost part; Fig. 6, an enlarged sectional detail of the clamping or holding ring to be referred to; Fig. 7, a perspective view of the folding-blades by which the marginal portion of the blank is contracted or folded inward and molded over the periphery of the former; Fig. 8, a plan view of the molding or contracting devices, parts being broken away and shown in section; Figs. 8c 9 to 12, inclusive, sectional views showing the appliances that operate directly upon the blank in the different positions assumed throughoutthe operation; Fig. 13, a plan view or pattern of a portion of the blank from which the abrasive cover is made; and Figs. let and 15, a plan view and side elevation, partlyin section, of the combined former and holder.

The blank a, which may be of the form shown in Fig. 13, after being suitably tempered, is placed upon an annular support I), as best shown in Fig. 5, which constitutes the lower member of the clamp or means for yieldinglyholdingthemarginalportionoftheblank in the operation of molding the sameto shape. Said annular or lower clamp member I) is supported over the folding-blades of the molding devices, which are themselves supported upon the bed or main framework B of the machine, the said molding devices having a recess below the central portion of the blank, in which recess is a die or plunger 0, the main function of which is to eject the finished padcover, as will be hereinafter described. The upper member of the clamp for the blank is shown as an annular plate 19 connected with a weight or presser 19 having guide-rods Z), that work in a suitable guideway D, supported on an arm E of the frame overhanging the bed B.

The clamp -plate proper, 11 is connected with the weight or presser b by means of slide-rods b (see Fig. 6,) and springs 19' are interposed between the weight and slide-rods, thus tending to press the clamping-ring Z1 downward yieldingly with relation to the weight or presser U At the completion of the operation of the machine the parts are in the position shown in Fig. 5, the upper clamp member having been raised and retained in elevated position by a latch Z2 operated as will be hereinafter described, which engages with a shoulder 11 connected with an arm or bracket 5 fastened to one of the guide-rods Z7 and provided with a latch-tripper Z1 which may be manipulated by the operator to disengage the latch b from the shoulder 19 and permit the upper clamp member to descend, so as to yieldingly hold the margin of the blank a between it and the lower clamp member I), as shown in Fig. 9. The former and holdercl d is then placed within the opening of the upper clamp member b and its presser as shown in Fig. 9, resting upon the middle unclamped portion of the blank, as shown. The said detachable former and holder is composed of a disk or plate d, preferably having its under face slightly convex, as shown, and having a central stem (1 which passes into a central opening 61 in the holder d the said stem 61 being provided with springarms 61 which tend to press outward into the opening d of the holder 61 said opening being tapered, as shown, from the central plane of the holder 01 toward the outer faces of said holder, so that the tendency of the spring-arm d in pressing outward is to press the holder (1 against the former d and to retain the twoin engaging contact, as shown in Fig. 9, until separated by pressure sufficient to contract the spring-arms d so that they will pass through the contracted mouth of the opening 61 The parts being in the position shown in Fig. 9, with the marginal portion of the blank yieldingly held by the clamp 19 b and the former (Z resting upon the middle portion of the blank, the said former is forcibly depressed by the plunger 2, which is connected with a slide or carrier 6 working in the guide D and provided with a rack, as shown in dotted lines, Fig. 2, engaged with a toothed segment e mounted on an arm a, pivoted at e in a projection F of the framework, said arm 6 being provided with a cam-roll 6,

working in the cam-groove c of a camf on the main shaft of the machine, by which the Various appliances are actuated at the proper time with relation to one another. The plunger e depresses the former d until its upper surface is somewhat below the lower clamp member I), as shown in Fig. 10, and in this movement the marginal portion of the blank has been pulled from between the clamp members b b a short distance and stretched into a substantially cylindrical shape, as shown in Fig. 10. The plunger 6 then rises slightly, and the cylindrical portion of the blank extending upward from the edge of the former d to the part which still remains held between the clamp members 19 11 as shown in Fig. 10, is then forcedinward over the upper surface of the former d, between said former and the holder (1 as shown in Fig. 11. This operation of forcing the blank inward with a molding pressure over the periphery of the former is performed by a series of foldingblades 9, connected with radially moving slides 9 (see Figs. 1 and 5,) provided with cam-rollers g working in cam-grooves g (bestshown in Figs] and 8) in an annularcamplate 9 provided with a toothed segment g, meshing with a rack 9 held in engagement therewith by a roller 9 and actuated by a cam g (see Figs. 1 and 4) on the main shaft of the machine. The cam-grooves g are eccentric to the cam-plate g which surrounds the blank, as shown ir Fig. 5, and a slight rotary movement of said cam-plate thus causes a radial inward moventeat of all the slides g and blades g connected jtherewith.

The alternate blades are made as shown in Fig. 7, in which the bla e at the right hand is represented in inverter. position to show the recesses g at its un er surface, which receive projections Q12 fron. the blades at each side thereof, thus permitt ng the blades to overlap during their radia inward and outward movement, so that th -v always present a continuous edge to the surf; e of the blank.

Theactuating-cam g fort folding-blades is so constructed as to throwaaem in and out with a quick movement, causing them to contract the marginal portion of the blank over the periphery of the former d and insert it between said former and the holder 61 as shown at the left hand in Fig. 11, where the blade 9 is represented in its inmost position, said blades leaving a fold of the marginal portion of the blank held between the former and holder, as shown at the right hand, Fig. 11, when said blades are withdrawn, as there shown.

The actuating cairn-groove e for operating the plunger 6 is so constructed as to permit a slight rise of the plunger as the blades 9 ad- Vance to enable them to enter with material between the former d and the holder d and after the blades are withdrawn, as shown at the right hand, Fig. 11, the plunger 6 has a slight downward movement, thus pressing the folded edges of the blank firmlybetween the former and holder.

During the above-mentioned operations the blank has been supported from below to some extent by the plunger before mentioned, which, however, is not essential to any of the operations thus far described. The said plunger c is supported on aguide-rod 0 provided with a rack, as shown in dotted lines, Fig. 2, engaged by a toothed segment 0 pivoted at 0 in a lug or bracket from the main frame of the machine and engaged by projections c c in a lever 0 also pivoted at 0 and provided with a cam-roll c operated by the cam-groove c in the cam f before mentioned. The projection c in the actuating-lever c", that engages with the under side of the arm of the toothed segment 0 is connected with said lever through the intervention of a spring 0 and thus causes the blank 0 to be held or actuated in its upward direction yieldingly instead of positively, and after the plunger is completely formed into the cover, as shown at the righthand in Fig. 11 and-at the left hand in Fig. 12, the said plunger 0 is moved upward far enough to lift the former and holder and the molded or finished cover thereon substantially above the level of the molding devices,

the plunger 0 having been previously raised to its highest position by the cam e In the depression of the plunger 6 the latch 19 before mentioned, which is pivotally supported upon a crossarm Z2 cc inected with the carrier e for the plunge" comes into engagement with the shoulde- -3 connected with the upper clamp member 77 and its presser 12 so that in the rise of the plunger 6 the upper clamp member is a so raised, as shown in Figs. 2 and 5, thus fleaving the former and holder and cover the-rein free to be discharged laterally from the -'.;.iachine when it has been raised by the plunger 0 out from the molding devices, as shown fat the right hand in Fig. 12, and such discharge is, as shown in this instance, eifected a' i omatically by a dischargearm m, pivoted t in" 011 the framework of the machine and connected with a link or slide m adapted to be actuated by a cam projection m. (See Fig. 2.)

The main shaft is shown as driven by a pulley H, which may be connected therewith by a clutch, shown as operated by a handle K, (see Fig. 1,) and a suitable friction band or brakef (see Fig. 2,) operating upon the periphery of the cam f, serves as a check to overcome the momentum and stop the machine promptly when the clutch is disengaged, which is done when the parts come to the po sition shown in Figs. 2 and 5 ready to receive a new blank.

The former d is preferably made, as shown, with a groove around its periphery and a removable band-such, for example, as a spiral spring d in said groove, being retained therein by its contractibility. This enables the former to be easily removed from the cover molded thereon without injuring the inturned flange formed around the margin of the cover. After the cover has been molded upon the former and is discharged from the machine while held by the former and the holder, as above described, it is dried, and thus sets, so as to retain the form to which it is molded, after which the holder 01 is separated from the former by pulling it off from the stem (1 thereof, after which the former may be withdrawn from the cover, leaving the peripheral band in the cover, the former thus reduced by the removal of said band therefrom readily passing out through the inturned flange of the cover without distorting the same, after which the same springband may be withdrawn from the molded margin of the cover, which is then ready for use, and the parts of the former and holder may then be put together again ready to cooperate in the formation of another abrasive cover.

We claim- 1. In a machine for making abrasive padcovers for buffing-machines from fiat blanks of abrasive material, aformer and a series of folding-blades surrounding said former, and means for moving said blades inward over the periphery of said former, substantially as described.

2. In a machine for making abrasive padcovers for bu fling-machines from H at blanks, a' support for the marginal portion of the blank and a former and means for pressing the same laterally against the middle portion of the blank, and means for molding the marginal portion of the blank inward over the periphery of the former, substantially as described.

3. In a machine for making abrasive padcovers for buffingmachines from flat blanks, a former and holder adapted to be yieldingly pressed against said former, and means for j molding the marginal portion of the blank over the periphery of the former and inserting the same between the former and holder, substantially as described.

4. The combination of means for yieldingly holding the marginal portion of a fiat blank, with means for pressing a former against the middle portion of the blank, and molding devices,and means for pressing the same against the portion of the blank between the periphcry of the former and the marginal holding devices, substantially as described.

5. In a machine for making abrasive padcovers for buffing-machines from flat blanks, a former and holder adapted to be yieldingly pressed against said former, and means for molding the marginal portion of the blank over the periphery of the former and insertin g the same between the former and holder, and means for ejecting the said former and holder with the cover molded thereon, sub-. stantially as described.

6. The combination of the former, with the holder and the spring whereby said holder names to this specification in the presence of and former are yieldingly pressed together, two subscribing Witnesses. substantially as described. 1 7. The former composed of a disk having 5 a detachable peripheral band, combined with J a holder yieldingly connected with said \Viinesses: former, substantially as described. H. J. LIVERMORE,

In testimony whereof We have signed our NANCY P. FORD. 

